It's pretty simple. Trump asked the FBI director to kill an investigation into his friends, and then fired him when he refused. Comey said he replied that "I agree he is a good guy" but said nothing to Trump about limiting the investigation.
Earlier this week, during the daily press briefing on May 15, White House Press Secretary Sean Spicer said a special prosecutor wasn't needed to look into the Russian Federation investigation.
Asked what he thinks of the Trump presidency, Putin said it's up to the American people to judge and his performance can be rated "only when he's allowed to work at full capacity", implying that someone is hampering Trump's efforts. It immediately escalated the legal stakes - and the potential political damage - for a president who has tried to dismiss the matter as partisan witch hunt and a "hoax".
The Russia issue has, however, clouded his early months in office.
Russian Federation has repeatedly denied interfering in the USA election.
President Donald Trump later acknowledged that he had already thought about dismissing Comey and that he was perturbed by "this Russian Federation thing", fueling criticism that Rosenstein's memo merely served as a pretext so the president could fire a law enforcement official conducting an aggressive investigation into his campaign.
Given that both Sessions and Trump will likely be subjects of the investigation, no employee of the Department of Justice - or the executive branch - would be able to effectively remain impartial.
In a statement, Deputy Attorney General Rod Rosenstein writes, he "determined it is in the public interest to appoint a Special Counsel, adding the decision is not a finding that crimes have been committed or that any prosecution is warranted".
"Believe me, there's no collusion", he said.
Trump, whose administration has been dogged by allegations that Russia helped him win the White House and that he and his allies are too cosy with Moscow, has defended his decision to discuss intelligence with the Russians after media reports of the meeting alarmed some USA and foreign politicians.
Comey's successor He said he would announce Mr Comey's successor "very soon".
Trump's allies say the president has failed to get a handle on the rolling crises, which have taken their toll on staff, according to interviews with about a dozen people in the White House or with close ties to the administration. But Trump later contradicted that explanation, saying he'd made up his mind to fire Comey well before Rosenstein's recommendation arrived on his desk.
They're at a loss as to how to deal with it, but are hopeful the administration will root out leakers and says attorney general Jeff SessionsJeff SessionsTrump White House feels under siege Senators told of broadening Russian Federation investigation House votes to expand death penalty for police killings MORE is committed to prosecuting leakers in instances where crimes may have been committed.
Hours after the report came out, GOP House Oversight Committee chairman Jason Chaffetz demanded that the Federal Bureau of Investigation turn over any and all "memoranda, notes, summaries and recordings" that the Federal Bureau of Investigation may have in its possession.
"Whatever review that Congress wants to do, I think that's the first step", she said. The two investigations could operate in parallel, much as the congressional investigations of Watergate proceeded in parallel to the criminal investigations conducted by the special prosecutors appointed by the Department of Justice, Archibald Cox and then-after the "Saturday Night massacre" -Leon Jaworski.
"I've always loved investigations", Mueller told author Garrett Graff in a revealing 2008 profile that ran under the headline "The Ultimate G-Man".
David Alan Sklansky is Stanley Morrison Professor of Law at Stanford Law School and a former federal prosecutor.
In 2011, he was asked by Democratic President Barack Obama for two more years, before being replaced by Mr Comey in 2013.
Sources tell FOX News, Mueller will have all the powers of a US attorney, including the ability to impanel a Grand Jury.
Although Mr. Mueller will serve at the pleasure of Mr. Rosenstein, the job comes with independence and autonomy.
How does this differ from an independent investigation?
November 6, 2016: Comey tells Congress in a follow-up letter that a review of newly discovered Clinton emails has "not changed our conclusions" that she should not face criminal charges.
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